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4/03
UNI-RAD Radiant Tube Burners Page 4803
Burner Selection Criteria
Burner SelectionThe UNI-RAD Burner can be used with various radianttube sizes, tube configurations, heat inputs, etc. Thefollowing information should be supplied to assistMaxon in matching the correctly sized UNI-RAD Burnerto your specific application:
1. Radiant tube inside and outside diameters2. Radiant tube configuration3. Furnace or process temperature4. Radiant tube length5. Radiant tube material6. Method of mounting (standard flange, packing
gland, etc.)7. Furnace wall thickness (see page 4800-S-1 for
mounting instructions)8. Requirement for heat recuperation (if used)
Typical Burner Firing Rates
Note: Burner firing rate is based on:1. 1000 Btu/CF Natural Gas2. 120" total "U" tube length within chamber3. 2% excess oxygen and 0% combustibles4. 100 Btu/sq.in. of tube surface area
View Port/Optic Flame Sensor Mount
GasInlet
ElectricalIgnition
Connection
IgnitionAir Inlet
CombustionAir Housing Radiant
Tube
Combustion Air
3"- 4"
The table at left gives typical maximum capacities forthe conditions shown. The UNI-RAD Burner has beenused with firing rates ranging from 80,000 Btu/hr to700,000 Btu/hr, depending upon tube length anddiameter.
Radiant Tube LifeCompetitive burner systems stress the fuel savingsobtained by the use of combustion air preheated to800° to 1000° from waste heat energy. The fact thatpreheated air produces much higher flame tempera-tures, and consequently decreases furnace alloy lifeis generally ignored. The UNI-RAD system overcomesthis problem through the use of pulse firing and hasconsistently shown increases in the furnace alloy lifewhile saving fuel. An extensive number of UNI-RADBurner users have increased their radiant tube life byas much as 300%.
UNI-RAD Burners have also successfully been appliedto silicon carbide tubes. These tubes can handle higheroperating temperatures than most alloy tubes, andallows for increased heat flux.
ConstructionThe UNI-RAD Burner is constructed of cast iron andcarbon steel with internal components constructed ofstainless steel. The air inlet tube length must bespecified when ordering to provide for differences in thefurnace wall thickness.
gnisuoHeziS
)sehcni(
)HFC(wolFsaGlarutaNyticapaCrh/utBdna
rh/utB0001x
noitsubmoCriAMFC
"4 151 82
"5.4 071 13
"5 881 53
"6 622 14
"7 462 84
"8 203 55
Page 4804 UNI-RAD Radiant Tube Burners
Burner Selection Criteria
Typical Piping Schematic(Four Burners)
PipingThe gas and air piping for the UNI-RAD Burner is
simple and direct. As shown in the piping schematicbelow, each UNI-RAD Burner uses one fuel gas line,one primary ignition air line, and one main combustionair line.
Gas MeteringA custom drilled gas spud orifice on each burner
sets the desired capacity. Typical gas pressurerequirements at the burner range from 8" – 24" w.c.depending upon customer requirements.
Air MeteringCombustion air flow is metered with a Limiting
Orifice Valve (LOV) located prior to the inlet of therecuperator. A minimum of supply air pressure of 10"w.c. at the inlet to the recuperator is usually required.Higher pressures may be necessary, depending uponburner capacity, or how the recuperator is sized.
Primary ignition air is usually less than 7% of totalair to the burner. The custom drilled air orifice in theignition air pipe assembly sets the value. An LOV issometimes used as a trim device to field optimize theburner ignition. The primary air is never throttled. It iskept on at all times.
CAUTION: If main air ball valve is inadvertentlyclosed, raw gas may be delivered to the tube,possibly creating an explosive condition.
ConclusionThe UNI-RAD Burner system has been successfully
applied to a variety of furnaces. Its success is due notonly to the quality of our equipment, but also to acareful evaluation of each application. We work withour customers to assure that every aspect of theircombustion system is designed for optimum perfor-mance. Please contact your local Maxon representa-tive for assistance.
MAX-SAVER®Recuperator
Air ControlValve
UNI-RADBurner
Main Gas ControlSolenoid Valve
Main AirLOV
Zone AirProof-of-Opening
Switch
BallValve
MaxonSeries FG
CombustionAir Blower ** Note: Optional Items.
Large multi-burner zones may balance easierwith individual main gas LOV's on each burner.
Ignition air can be set easier with individualignition air LOV 's on each burner.
Ma
in G
as
Ign
itio
n A
ir
Ma
in G
as
Ign
itio
n A
ir
Ma
in A
ir H
ead
er
Ma in Ai r
Ma in Ai r
I gn i t i on A i r
From Zone Fuel Regulator& Safety Valve Train
Ma in G as Ma i n Gas
** Note:
UNI-RAD Radiant Tube Burners Page 4805
4/03
MAX-SAVER®
U-Shaped In-Situ Recuperator
The Maxon UNI-RAD Burner System consists of twomajor components:
– UNI-RAD Direct Spark Ignited Burner– MAX-SAVER® In-Situ Recuperator
RadiantTube
(by others)
Y
Air Inlet
MAX-SAVER®Recuperator
UNI-RADBurner
Schedule 40 Piping
Y
Typical Burner / Recuperator Layout
Section Y-Y shown on page 4806
When these features are combined, they provide thefollowing advantages over existing systems:• Fuel savings ranging from 25% to 50% over non-
recuperative systems• Increased alloy life• Improved furnace temperature uniformity• Improved production quality• Long recuperator life
Exhaust Stack Eductor(by others)
Draw Band(by others)
Cold Combustion Air
Radiant Tube(by others)
Bulkhead Plate(by others)
Pre-heated Combustion Air
OptionalExhaustCooling
Air
Page 4806 UNI-RAD Radiant Tube Burners
MAX-SAVER®
U-Shaped In-Situ Recuperator
Section View Y-Y
8.25"
0.25"HRS
31.3"
1.5"NPT
Recuperator #58065
Weld
Weld
304 SS
Section A - A
REF: Drawing #SER_5287A
11.00" Dia.
7.00" O.Dia.6.85" I.Dia.
9.50" Bolt Circle
0.75" Hole
Draw Bands (by Maxon)
Custom draw band designs are availablefrom Maxon by special request.
UNI-RAD Radiant Tube Burners Page 4807
4/03
Dimensions (in inches)
*eziSgnisuoH A B C DE
TPNF
.D.I
RU452.1 83.3 52.6 83.3 91.5 "4/1-1 0.4
RU552.1 83.3 52.6 83.3 91.5 "4/1-1 0.5
RU45.1 83.3 32.6 83.3 91.5 "2/1-1 0.4
RU55.1 83.3 32.6 83.3 91.5 "2/1-1 0.5
RU65.1 83.3 32.6 83.3 91.5 "2/1-1 0.6
RU75.1 83.3 32.6 83.3 91.5 "2/1-1 0.7
RU62 36.3 52.6 36.3 91.7 "2 0.6
RU72 36.3 52.6 36.3 91.7 "2 0.7
RU82 36.3 52.6 36.3 91.7 "2 0.8
)retemaidedisni("F"noisnemiddna)TPN("E"noisnemid;gnisuohrenrubfoezisotsrefeR*
telnIriAhtgneLebuT
htgneLlavomeR htgneLllarevOelzzoN
htgneLnoisurtorPelzzoN&ebuTriAhtgneLylbmessA
ebuTsaGylbmessA
"0.4 "0.92 "2.02 "4.3 "52.9 "57.11
"0.7 "0.23 "2.32 "4.6 "52.21 "57.41
"5.9 "5.43 "7.52 "9.8 "57.41 "52.71
"5.11 "5.63 "7.72 "9.01 "57.61 "52.91
"5.31 "5.83 "7.92 "9.21 "57.81 "52.12
]1["5.51 "5.04 "7.13 "9.41 "57.02 "52.32
]1["5.71 "5.24 "7.33 "9.61 "57.22 "52.52
.tseuqerlaicepsybelbaliavA]1[
UNI-RAD Burners - used with metal tubes
7.833.02
4 holes3/4" dia.
1/2" NPT
A
C
D
B
Sec. A
Sec. A
1/2" NPTAir Inlet
3/4" NPTGas Inlet
Removal Length
Overall Length
E NPT
4.13
F
NozzleProtrusion
Length
Section A-AAir Inlet
Tube & NozzleAssembly Length
Air InletTube Length
2.81
0.47
8.45
6.31
16.76
Page 4808 UNI-RAD Radiant Tube Burners
Dimensions (in inches)
*gnisuoHeziS
A B C DE
TPNF
.D.I
RUC5.452.1 83.3 52.6 83.3 91.5 "4/1-1 5.4
RUC65.1 83.3 52.6 72.3 91.5 "2/1-1 0.6
)retemaidedisni("F"noisnemiddna)TPN("E"noisnemid;gnisuohrenrubfoezisotsrefeR*
UNI-RAD Burners - used with silicon carbide tubes
A B
1/2" NPTAir Inlet
Sec. A
7.833.02Sec. A
4 holes3/4" dia.
1/2" NPT
DC
Removal Length
OverallLength
E NPT
6.198.38
18.83
F
NozzleProtrusion
Length2.81
8.45
Section A-A
Air InletTube Length
Air InletTube & Nozzle
Assembly Length
3/4" NPTGas Inlet
0.47
telnIriAhtgneLebuT
htgneLlavomeR htgneLllarevOelzzoN
htgneLnoisurtorPelzzoN&ebuTriAhtgneLylbmessA
ebuTsaGylbmessA
"0.4 "0.13 "2.02 "3.1 "52.9 "57.11
"0.7 "0.43 "2.32 "3.4 "52.21 "57.41
"5.9 "5.63 "7.52 "8.6 "57.41 "52.71
"5.11 "5.83 "7.72 "8.8 "57.61 "52.91
"5.31 "5.04 "7.92 "8.01 "57.81 "52.12
]1["5.51 "5.24 "7.13 "8.21 "57.02 "52.32
]1["5.71 "5.44 "7.33 "8.41 "57.22 "52.52
.tseuqerlaicepsybelbaliavA]1[
UNI-RAD Radiant Tube Burners Page 4809
11/03
Dimensions (in inches)
MAX-SAVER Recuperator - 1.25"
1.25" NPT
10.38
3.94 *3.75" to 5.5" dia.
28.0
3.0 3.0 3.0 3.0 7.0
2.13
2.25
1.66 dia.
*Baffle diameters are normally selected to be 0.25" smaller than the I.D. of thefiring tube
MaxSaver® 1.25" RecuperatorPressure Drop vs. Flow at Various Preheat Temperatures
MAX-SAVER Recuperator - 1.5"
1.9 dia.
1.5" NPT
10.38
3.10*From 3.5" to
7.5" dia.
28.0
12.0
4.15
9.06.06.0
6.0
*Baffle diameters are normally selected to be 0.25" smaller than the I.D. of thefiring tube
Page 4810 UNI-RAD Radiant Tube Burners
Dimensions (in inches)
MaxSaver® 1.5" RecuperatorPressure Drop vs. Flow at Various Preheat Temperatures
4240.539
37.536
34.533
31.530
28.527
25.524
22.521
19.518
16.515
13.512
10.59
7.56
4.53
1.5
MAX-SAVER Recuperator - 2"
4.63*5.5" to 10.0 dia.
28.0
12.0
9.06.06.0
2" NPT
2.38 dia.
14.35 5.1
6.0
*Baffle diameters are normally selected to be 0.25" smaller than the I.D. of thefiring tube
Dimensions (in inches)
UNI-RAD Radiant Tube Burners Page 4811
Dimensions (in inches)
11/03
MaxSaver® 2" RecuperatorPressure Drop vs. Flow at Various Preheat Temperatures
UNI-RAD Burner Component Identification
A
Q
R
K LM
S
AA
BBBB
EE
FF GGHH
KK
JJ
DDCC
T
U
Z
V
W
X
Y
NO P
BC
D
E
A
F
G
H
I
J
metI rebmuNtraP noitpircseD
A 01402 GULPEPIPWLH"521.
B 48291 LGNTVSBOTPN"5.
C 34975 RCLLAM"5.
D 24975 RDLHDUPS72-"5.
E 06102 GULP-AC"57.
F 93975 GHSBXEHLTS"521.X"57.
G 48262 EETLLAM"57.X"57.X"57.
H 04975 SAGNIAM-DUPSRB72-"5.
I 34402 LPNSLCLTSKLB"5.
J 21012 GHSBXEHLTS"521.X"5.
K 27073 GHSBXEHLTS"5.X"1
L 01545 XEHDTLP7104OSI52X8M
M 81371 GLF"1
N 7750501 TKSGTNRBDAR-INU
O 21545 UNXEHNIFDTLP52.1-8M
P 2399301 SLCRHSW9807OSINLP-8M
Q 5833501 YSAEPIPRIANGIDAR-INU
R 7933501 RCSTESTPENOC01X9M
S 4123501 GSHRNRB
metI rebmuNtraP noitpircseD
T 65975 DORNGI
U 86975 LSNIEDI"52.
V 7750501 TKSGRNRBDAR-INU
W 07975 GLFNTERLSNINGI
X 2399301 SLCRHSW9807OSINLP-8M
Y 0106401 DHXEHSS7104OSI61X8M
Z 92535 PACMRETNGI
AA 1760501 LSNICMRCDI"526.
BB 74975 RLCGDLHTLNISAG
CC 55975 LSNIDI"573.1
DD 84975 LSNIDI"578.
EE --- YSABTTLNISAG
FF 17975 RDPSGRTNCCMRC
GG --- YSAELZZON&EBUTRIA
HH 03085 TKSGGTSCRNRB
JJ --- TKSGTLNIRIA
KK --- GSHTLNIRIARNRB
egaptxenees,smetidedahsfosrebmuntraproF
Page 4812 UNI-RAD Radiant Tube Burners
UNI-RAD Burner Component Identification
-"JJ"metI teksaGtelnIriA
eziSgnisuoHJJ
TKSGTLNIRIA
RU452.1 57975
RUC5.452.1 67975
RU552.1 67975
RU45.1 57975
RU55.1 67975
RU65.1 68285
RUC65.1 68285
RU75.1 38285
RU62 0633501
RU72 0633501
RU82 0633501
"KK"metI - gnisuoHtelnIriArenruBsebutyollarof )evobaderutcip(
eziSgnisuoHKK
GSHTLNIRIARNRB
RU452.1 4613501
RU552.1 5603501
RU45.1 6613501
RU55.1 7613501
RU65.1 8603501
RU75.1 9613501
RU62 0713501
RU72 1713501
RU82 2713501
-"EE"metI ylbmessAebuTtelnIsaG
ebuTtelnIriAhtgneL
"A"noisnemiDylbmessAebuTtelnIsaG
htgneL
EEYSABTTLNISAG
"0.4 57.11 85085
"0.7 57.41 95975
"5.9 52.71 05085
"5.11 52.91 45085
"5.31 52.12 6171401
]1["5.51 52.32 5513501
]1["5.71 52.52 6513501
-"GG"metI ylbmessAelzzoN&ebuTriA
telnIriAhtgneLebuT
"B"noisnemiDelzzoN&ebuTriAhtgneLylbmessA
GGYSAELZZON&EBUTRIA
"0.4 52.9 65085
"0.7 52.21 85975
"5.9 57.41 84085
"5.11 57.61 25085
"5.31 57.81 7313501
]1["5.51 57.02 8313501
]1["5.71 57.22 9313501
nasaylnoelbaliavaelzzondnaebutriA:ETONsmetietarapeston,ylbmessa
EE
GG
KK
"A"
"B"
JJ
NozzleAir InletTube
KK1
KK2
KK3KK4
KK5
KK6
KK7
"KK"metI gnisuoHtelnIriArenruB-sebutedibracnocilisrof )tfeltaderutcip(
ebuTeziS
1KKgnisuoH
2KKwercS
3KKrehsaW
4KKgniR
5KKteksaG
6KKdnalGglP
7KKtuN
C"5.4 3713501 03645 2399301 2323501 0523501 3323501 52645
C"6 4713501 03645 2399301 6323501 1523501 5323501 52645
UNI-RAD Radiant Tube Burners Page 4813
[1] Available by special request.
11/03
Notes
Page 4814 UNI-RAD Radiant Tube Burners